Advanced Refrigeration Tonnage Calculator
Capacity Comparison Chart
Example Data Table
| Application | Cooling Load | Approx. TR | Typical Use |
|---|---|---|---|
| Small cold room | 24,000 BTU/hr | 2.00 TR | Storage and display |
| Medium process room | 60,000 BTU/hr | 5.00 TR | Process cooling |
| Commercial chiller zone | 180,000 BTU/hr | 15.00 TR | HVAC plant sizing |
| Industrial refrigeration line | 360,000 BTU/hr | 30.00 TR | Production cooling |
Formula Used
Standard refrigeration tonnage: TR = BTU/hr ÷ 12,000.
Cooling kW: Cooling kW = BTU/hr ÷ 3,412.142.
Airflow method: BTU/hr = 1.08 × CFM × ΔT°F.
Chilled water method: BTU/hr = 500 × GPM × ΔT°F.
Electrical COP method: Cooling kW = electrical kW × COP.
Electrical current: single phase amps = watts ÷ volts ÷ power factor. Three phase amps = watts ÷ 1.732 ÷ volts ÷ power factor.
How to Use This Calculator
Select the method that matches your available data. Use known load when a heat gain report already gives BTU/hr or kW. Use airflow when CFM and temperature drop are available. Use chilled water when flow and water temperature difference are known.
Enter safety, diversity, and derating values carefully. A safety factor increases the final size. A diversity factor allows load sharing. Derating compensates for site conditions. Then enter voltage, phase, and power factor to estimate electrical current.
Press calculate to view the result above the form. Use CSV for spreadsheet records. Use PDF for a clean report.
Refrigeration Tonnage in Electrical Planning
Why Tonnage Matters
Refrigeration tonnage is a practical way to express cooling capacity. One ton equals 12,000 BTU per hour. It also equals about 3.517 kW of cooling. Electrical teams use this value to estimate equipment size, compressor demand, feeder load, and starting current. It helps connect thermal design with power planning.
Common Input Methods
A designer may already know the cooling load from a heat gain study. In that case, direct conversion is best. For air systems, airflow and temperature drop can estimate sensible load. For hydronic systems, water flow and temperature difference are useful. For existing equipment, electrical input with COP or EER can estimate delivered cooling.
Using Adjustments
Real installations rarely match ideal conditions. Doors open. Product loads change. Ambient temperature rises. Filters get dirty. A safety factor can protect the design from small errors. Diversity can reduce oversized totals when all loads do not peak together. Altitude or condenser derating can increase the required nominal size.
Electrical Checks
After cooling tons are estimated, the calculator converts cooling demand into expected electrical input. COP is used for this step. Higher COP means better efficiency and lower electrical load. The tool then estimates current from voltage, phase, and power factor. This supports cable sizing, breaker review, panel planning, and generator checks.
Good Design Practice
Use this calculator for planning, comparison, and preliminary sizing. Confirm final equipment with manufacturer data. Check compressor starting method, locked rotor current, voltage drop, ambient limits, refrigerant type, and local electrical rules. Oversizing can reduce efficiency. Undersizing can fail during peak load. A balanced result gives better reliability and cost control.
FAQs
1. What is one ton of refrigeration?
One ton of refrigeration equals 12,000 BTU per hour. It is also about 3.517 kW of cooling capacity.
2. Can this calculator estimate electrical current?
Yes. It estimates input power from COP. Then it calculates current using voltage, phase, and power factor.
3. Which method should I use?
Use known load when you have BTU/hr or kW. Use airflow for duct systems. Use water flow for chilled water systems.
4. What safety factor is suitable?
Many early estimates use 5% to 15%. Critical refrigeration systems may need deeper review before selecting final equipment.
5. Does diversity reduce tonnage?
Yes. Diversity reduces the combined peak when all connected loads do not operate at full demand together.
6. What is COP?
COP means coefficient of performance. It compares cooling output to electrical input. A higher COP means better efficiency.
7. Is airflow calculation total cooling?
The airflow formula estimates sensible cooling only. It does not fully include latent moisture removal or humidity effects.
8. Can I use this for final equipment selection?
Use it for planning and checks. Final selection should follow manufacturer data, site conditions, and local electrical codes.